1 /* 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3 * Copyright (C) 2003 Daniel M. Eischen <deischen@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/types.h> 32 #include <sys/signalvar.h> 33 #include <sys/rtprio.h> 34 #include <sys/mman.h> 35 #include <pthread.h> 36 37 #include "thr_private.h" 38 39 /*#define DEBUG_THREAD_KERN */ 40 #ifdef DEBUG_THREAD_KERN 41 #define DBG_MSG stdout_debug 42 #else 43 #define DBG_MSG(x...) 44 #endif 45 46 static struct umutex addr_lock; 47 static struct wake_addr *wake_addr_head; 48 static struct wake_addr default_wake_addr; 49 50 /* 51 * This is called when the first thread (other than the initial 52 * thread) is created. 53 */ 54 int 55 _thr_setthreaded(int threaded) 56 { 57 if (((threaded == 0) ^ (__isthreaded == 0)) == 0) 58 return (0); 59 60 __isthreaded = threaded; 61 return (0); 62 } 63 64 void 65 _thr_assert_lock_level() 66 { 67 PANIC("locklevel <= 0"); 68 } 69 70 int 71 _rtp_to_schedparam(const struct rtprio *rtp, int *policy, 72 struct sched_param *param) 73 { 74 switch(rtp->type) { 75 case RTP_PRIO_REALTIME: 76 *policy = SCHED_RR; 77 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 78 break; 79 case RTP_PRIO_FIFO: 80 *policy = SCHED_FIFO; 81 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 82 break; 83 default: 84 *policy = SCHED_OTHER; 85 param->sched_priority = 0; 86 break; 87 } 88 return (0); 89 } 90 91 int 92 _schedparam_to_rtp(int policy, const struct sched_param *param, 93 struct rtprio *rtp) 94 { 95 switch(policy) { 96 case SCHED_RR: 97 rtp->type = RTP_PRIO_REALTIME; 98 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 99 break; 100 case SCHED_FIFO: 101 rtp->type = RTP_PRIO_FIFO; 102 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 103 break; 104 case SCHED_OTHER: 105 default: 106 rtp->type = RTP_PRIO_NORMAL; 107 rtp->prio = 0; 108 break; 109 } 110 return (0); 111 } 112 113 int 114 _thr_getscheduler(lwpid_t lwpid, int *policy, struct sched_param *param) 115 { 116 struct rtprio rtp; 117 int ret; 118 119 ret = rtprio_thread(RTP_LOOKUP, lwpid, &rtp); 120 if (ret == -1) 121 return (ret); 122 _rtp_to_schedparam(&rtp, policy, param); 123 return (0); 124 } 125 126 int 127 _thr_setscheduler(lwpid_t lwpid, int policy, const struct sched_param *param) 128 { 129 struct rtprio rtp; 130 131 _schedparam_to_rtp(policy, param, &rtp); 132 return (rtprio_thread(RTP_SET, lwpid, &rtp)); 133 } 134 135 void 136 _thr_wake_addr_init(void) 137 { 138 _thr_umutex_init(&addr_lock); 139 wake_addr_head = NULL; 140 } 141 142 /* 143 * Allocate wake-address, the memory area is never freed after 144 * allocated, this becauses threads may be referencing it. 145 */ 146 struct wake_addr * 147 _thr_alloc_wake_addr(void) 148 { 149 struct pthread *curthread; 150 struct wake_addr *p; 151 152 if (_thr_initial == NULL) { 153 return &default_wake_addr; 154 } 155 156 curthread = _get_curthread(); 157 158 THR_LOCK_ACQUIRE(curthread, &addr_lock); 159 if (wake_addr_head == NULL) { 160 unsigned i; 161 unsigned pagesize = getpagesize(); 162 struct wake_addr *pp = (struct wake_addr *) 163 mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE, 164 MAP_ANON|MAP_PRIVATE, -1, 0); 165 for (i = 1; i < pagesize/sizeof(struct wake_addr); ++i) 166 pp[i].link = &pp[i+1]; 167 pp[i-1].link = NULL; 168 wake_addr_head = &pp[1]; 169 p = &pp[0]; 170 } else { 171 p = wake_addr_head; 172 wake_addr_head = p->link; 173 } 174 THR_LOCK_RELEASE(curthread, &addr_lock); 175 p->value = 0; 176 return (p); 177 } 178 179 void 180 _thr_release_wake_addr(struct wake_addr *wa) 181 { 182 struct pthread *curthread = _get_curthread(); 183 184 if (wa == &default_wake_addr) 185 return; 186 THR_LOCK_ACQUIRE(curthread, &addr_lock); 187 wa->link = wake_addr_head; 188 wake_addr_head = wa; 189 THR_LOCK_RELEASE(curthread, &addr_lock); 190 } 191 192 /* Sleep on thread wakeup address */ 193 int 194 _thr_sleep(struct pthread *curthread, int clockid, 195 const struct timespec *abstime) 196 { 197 198 if (curthread->wake_addr->value != 0) 199 return (0); 200 201 return _thr_umtx_timedwait_uint(&curthread->wake_addr->value, 0, 202 clockid, abstime, 0); 203 } 204 205 void 206 _thr_wake_all(unsigned int *waddrs[], int count) 207 { 208 int i; 209 210 for (i = 0; i < count; ++i) 211 *waddrs[i] = 1; 212 _umtx_op(waddrs, UMTX_OP_NWAKE_PRIVATE, count, NULL, NULL); 213 } 214